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{{tag>hsts apache security header hardening http https ssl encryption howto}}
====== Check HSTS Header ======
* [[https://tools.ietf.org/html/rfc6797#section-5.2|Documentation for HSTS]]

How to check the HSTS header of a Host.

===== Host without HSTS =====
<sxh bash; gutter: false>
curl --head -s https://www.example.com/
</sxh>

  HTTP/2 200 
  accept-ranges: bytes
  age: 319222
  cache-control: max-age=604800
  content-type: text/html; charset=UTF-8
  date: Tue, 19 Jan 2021 22:57:03 GMT
  etag: "3147526947"
  expires: Tue, 26 Jan 2021 22:57:03 GMT
  last-modified: Thu, 17 Oct 2019 07:18:26 GMT
  server: ECS (nyb/1D1E)
  x-cache: HIT
  content-length: 1256


===== Host with HSTS =====
<sxh bash; gutter: false>
curl --head -s https://www.sdk.de/
</sxh>
  HTTP/1.1 200 OK
  Date: Tue, 19 Jan 2021 22:56:20 GMT
  Server: Apache
  Content-Language: de
  Expires: Wed, 20 Jan 2021 15:32:32 GMT
  Cache-Control: max-age=59772
  Pragma: public
  Strict-Transport-Security: max-age=16070400; includeSubDomains
  Vary: Host,User-Agent
  Content-Security-Policy: img-src 'self' data: app.usercentrics.eu maps.googleapis.com www.facebook.com www.youtube.com www.google.com google.com *.google.com www.google.de google.de *.google.de rtclauncher.luware.com rtclauncherapi.luware.com maps.gstatic.com *.ressourcenmangel.de ressourcenmangel.de *.google-analytics.com google-analytics.com maps.google.com *.googletagmanager.com googletagmanager.com googleadservices.com googleusercontent.com *.etracker.com etracker.com *.etracker.de etracker.de stats.g.doubleclick.net; script-src 'self' tagmanager.google.com www.google.de app.usercentrics.eu www.youtube.com s.ytimg.com maps.googleapis.com 'unsafe-inline' 'unsafe-eval' www.facebook.com connect.facebook.net www.google.com rtclauncher.luware.com maps.gstatic.com *.freegeoip.net freegeoip.net app.usercentrics.eu *.googletagmanager.com googletagmanager.com *.etracker.com etracker.com *.etracker.de etracker.de maps.googleapis.com maps.google.com *.google-analytics.com google-analytics.com *.gstatic.com gstatic.com;
  X-XSS-Protection: 1; mode=block
  Referrer-Policy: no-referrer-when-downgrade
  X-UA-Compatible: IE=edge
  X-Content-Type-Options: nosniff
  X-Frame-Options: ALLOWALL
  Content-Type: text/html; charset=utf-8

<sxh bash; gutter: false>
curl --head -s https://www.sdk.de/ | grep Strict
</sxh>
  Strict-Transport-Security: max-age=16070400; includeSubDomains

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